| US 7,450,538 B2 | ||
| Method for operating a system with a multiplicity of nodes and a base station according to TDMA and a system for this purpose | ||
| Christoffer Apneseth, Oslo (Norway); Harald Vefling, Borgheim (Norway); Jan Endresen, Asker (Norway); and Dacfey Dzung, Wettingen (Switzerland) | ||
| Assigned to ABB Research Ltd, Zurich (Switzerland) | ||
| Appl. No. 10/516,612 PCT Filed Aug. 06, 2003, PCT No. PCT/EP03/08691 § 371(c)(1), (2), (4) Date Jul. 26, 2005, PCT Pub. No. WO2004/023419, PCT Pub. Date Mar. 18, 2004. |
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| Claims priority of application No. 102 37 799 (DE), filed on Aug. 17, 2002; and application No. 103 34 873 (DE), filed on Jul. 29, 2003. | ||
| Prior Publication US 2006/0165026 A1, Jul. 27, 2006 | ||
| Int. Cl. H04M 3/00 (2006.01); H04M 5/00 (2006.01) | ||
| U.S. Cl. 370—322 [455/41.2; 455/41.3; 455/456.1; 455/556.1; 455/90.1] | 4 Claims |
| 1. A system with a multiplicity of wireless sensors and/or actuators as nodes (S.1 . . . S.n) and a base station (BS), which is installed in a machine or installation, such as industrial robots or an automated
manufacturing or production unit,
a) wherein the sensors have a sensor head which detects a sensor environment and the actuators have an actuator unit and a
control unit to detect an actuator environment,
b) wherein cyclical TDMA data transmission blocks are transmitted and each TDMA data transmission block is composed of consecutive
time slots,
c) wherein each time slot is allocated to a specific node,
d) wherein the base station receives uplink signals that comprise sensor signals from the sensors and signals indicating the
current status of actuators,
e) wherein the uplink signals (UL.1 . . . UL.n) can be transmitted from the different nodes (S.1 . . . S.n) to the base station (BS) simultaneously on at least two different frequencies (f1, f2, . . . f3),
f) wherein the downlink signals (DL) are transmitted from the base station (BS) to the different nodes (S.1 . . . S.n) on only one frequency, which differs from the uplink frequencies,
g) wherein the downlink signals comprise control signals to activate/deactivate the actuators and signals to set specific
parameters of the actuators sensors,
h) wherein the time slots and the different uplink frequencies of the different nodes are defined once and are thereafter
retained, so that the receiver of the base station (BS) can identify the relevant sensor/actuator node (S.1 . . . S.n) from the number and frequency allocated to each time slot.
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